What can happen in this case

Dear , Since you have not responded to our colleague MS Deesha, we give you exactly 6 hours from the sate of this email to rejoin office virtually. If you fail to do so, we are taking immediate legal actions against you. You owe the company money for the 7 days that you have been paid in December. For every day that this money is not returned- from December 31s onwards there is an interest of daily interest of 500 INR. This means that apart from the 7 days salary until now you owe us 2 days x 500 INR = 1000INR on top. In addition we wil inform India Nasscom and black list you in all HR databases.You will also receive no exit papers and a very negative reference if a future employer reaches out to us.With this email we are aiming to make very clear the financial, legal and HR consequences as a result of your actions. My company is sending me this email, I i have given resignation, and I was supposed to receive paid holidays. and now they are asking to pay money, I have joined another company, I don't want to work with my previous company what should I do in this case. Am I in trouble. I don't want to get involve in this case. They have mentally harasssed me.